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The WSC maintains Canada's hydrometric data network, widely referred to as HYDAT. Previously over 2,500 hydrometric gauges were maintained. Currently fewer than 2000 stations provide active data. [1] Stations or gauges record lake and river water levels that are used to compute river flow data.
The water levels of Kenosee Lake have been monitored periodically over the last 150 years since the first land surveyors came in the 1870s. It has been shown that lake levels have fluctuated greatly in the past. Tree stumps exist today that are rooted lower than any recorded level of the lake.
The decrease in water levels provided an increase the water temperatures. By 1980 water temperatures in the Nechako River had risen above what Fisheries and Oceans Canada (DFO) consider to be safe for migrating and spawning salmon. In response to the DFO studies, the federal government asked Alcan to increase water flow from the Nechako ...
Like all wetlands, these depend upon the seasonal fluctuations in the water level. [15] High water levels help create and maintain silver maple swamps, [16] while low water periods allow many rare wetland plants to grow on the emerged sand and clay flats. [17] There are five principal wetland vegetation types. One is swamp, mostly silver maple.
In the summer of 2015, Metro Vancouver had a particularly dry summer and the three reservoirs experienced very low water levels due to a lack of precipitation. In the months of May, June, July, and August (before August 27), Vancouver experienced 4 mm (0.16 in), 11 mm (0.43 in), 21 mm (0.83 in), and 10 mm (0.39 in) of rain, respectively. [ 18 ]
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The treaty states that during daylight time during the tourist season (April 1 to October 31), there must be 2,800 cubic metres per second (99,000 cu ft/s) of water flowing over the falls, and during the night and off-tourist season there must be 1,400 cubic metres per second (49,000 cu ft/s) of water flowing over the falls.
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